On Jul. 22, 2020, University of California at Los Angeles researchers reported that they found. levels of antibodies against SARS-CoV-2 dropped dramatically over the first 3 months of infection in 34 people recovered from mild illness.

The research letter, published in the New England Journal of Medicine, said that antibody levels against the novel coronavirus decreased by about half every 73 days and, if that rate were sustained, would be depleted within about a year.